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Polarisability and Fajan's Rule

Which of the ...

Question

Which of the above represents the formula for the most common compound of $X$ and $Y$ ? Where $X$ is $C a$ and $Y$ is $F$ .

A

X_{2} Y

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B

X Y

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C

X Y_{2}

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D

X Y_{3}

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E

X Y_{4}

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Solution

The correct option is C $X Y_{2}$
$X Y$ $_{2}$ represents the formula for the most common compound of $X$ and $Y$ .
$X$ and $Y$ represent $C a$ (bivalent) and $F$ (monovalent).
So they form calcium fluoride $C a F$ $_{2}$ or $X Y$ $_{2}$ .

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